Fire-extinguisher.



J. AUGUST.

FIRE EXTINGUISHER. APPLICATION FILED JAN-24.1918.

l ,297, 3 l 0., Patented Mar. 18, 1919.

OFFICE.

JOSEPH AUGUST, 013 BOSTON, MASSACHUSETTS.

FIRE-EXTINGUICSHEB.

provemen ts in Fire-Extinguishers, of which the following is a specification.

It is 'awell known fact that tetra-chlorid of carbon is one of the most efiicient agents for extinguishing fire. In View of this 1t has been tried on numerous occasions to charge the conventional fire extinguisher with this agent, instead of the present chemical solution used. It was found, however, that this was impracticable due to the fact that the carbonic acid gas mixed with the tetra-chlorid of carbon causing very unsatisfactory results.

In as far as is known, nitrogen is the only gas which will not mix with tetrachlorid of carbon and I have therefore conceived the idea of charging a fire extinguisher with nitrogen gas under pressure and tetra-chlorid of carbon, the former serving to eject the latter from the extinguisher.

One convenient employment of my invention-is disclosed in the accompanying drawing in which the figure discloses a sectional side elevation of a hand "fire extinguisher, charged in accordance with my idea.

Referring more particularly to the drawings, it will be seen that the reference A designates the container which is entirely closed a't the bottom, but is provided with a small opening at its upper end through which atube B projects which tube extends to within a. half inch 'of thebottom of the container and is open at such end. The opposite endof the tube B projects beyond. the top of the container A and is provided at this end with a hand control valve C. D designates an inlet through which communica- Spe'cification of Letters Patent.

tion may be had with the interior of' the extinguisher and by means of which said extinguisher may be charged, with both nitrogen and tetra-chlorid although I wish it understood that any suitable means of introducing these agents into the interior of the extinguisher may be employed.

E discloses the position which the tetragen, which, by virtue of being lighter than the tetra-chlorid of carbon, occupies the uppermost position within the extinguisher.

It will, of course, be understood that the nitrogen is introduced to the interior of the-extinguisher under pressure and that any convenient ressure may be used, although I have ound that the best working pressure averages from 75 to 100 pounds per square inch.

Although I have disclosed my idea of utilizing nitrogen as an expelling agent for tetra-chlorid of carbon in a hand extinguisher,I Wish it to be understood that the use of the same is not limited tothis type of extinguisher, 'but may be utilized in any form more convenient. I

Having described my invention what I claim is:

Patented Mar. 18, 1919.

Application filed January 24, 1918. Serial No. 213,550.

' chlorid of carbon occupies and F the nitro- 1. Tetra-chlorid of carbon and nitrogen to the lowermost part of said tank, the

lower portion of the tank being filled with tetra-chlorid ofcarbon and an expelling agent located above such tetra-chlorid of carbon and being in direct contact therewith such expelling agent being nitrogen gas.

JOSEPH AUGUST. 

